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Math Help - y = mx + b problems

  1. #1
    Newbie
    Joined
    Feb 2010
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    6

    y = mx + b problems

    Hey guys,
    I'm really stumped on a couple of these problems and was wondering if someone could offer some advice.

    y = 3(1-x)
    x - y = 0

    The object of these problems is to find if they are things like:

    -Diagonal line of slope = -1
    -Vertical line
    -Diagonal line of slope = 1
    -Horizontal line

    Thanks!
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  2. #2
    Member mohammadfawaz's Avatar
    Joined
    Feb 2010
    From
    Lebanon - Beirut
    Posts
    100
    Hey..
    If you try to rewrite the two equations in the form y=ax+b then you will get:
    y = -3x+3
    y = x
    You know that the slope is the coefficient of x i.e. the number a.
    for the first question, no equation has a slope of -1
    for the second question, you have to know that a vertical line has a slope of infinity and it can't be represented in the form y=ax+b. It is rather represented as x=k. So no equation from the given satisfies this condition.
    for the third question, you can see that the second equation y = x has a slope of 1.
    for the fourth question, you have to know that a horizontal line has a slope of 0 and it is represented as y=m. So, no equation from the given satisfies this condition.
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